DATA BUS

DATA

COMMAND

DATA

DATA

STATUS

NVCR

NHDR

NDATA

T0-T15

1

2

3

4

5

6

7

NCMDSTRB

NDATAST

DATA BUS

DATA

DATA

DATA

COMMAND

STATUS

NVCR

T0-T15

1

2

3

4

NCMDSTRB

NSSTRB

DATA BUS

TRAN CMD

REC CMD

DATA

DATA

STATUS

NVCR

NHDR

NDATA

T0-T15

1

2

3

8

5

6

7

4

NCMDSTRB

STATUS

NDATAST

4

SCDCT2578 REV B 3/11/98

MESSAGE FORMATS

BC TO RT TRANSFER

1. Valid command word received, contents available on T0-T15 for illegalization purposes.

2. First valid data word (1760 header word) received, contents available on T0-T15 and stored in 32 word data memory.

3. Second valid data word received, contents available on T0-T15 and stored in 32 word data memory.

4. Last valid data word received, contents available on T0-T15 and stored in 32 word data memory. Status bits must be valid within 250nS.

5. Status register contents transferred to transmit buffer.

6. NCMDSTRB indicates valid message received, command word available on T0-T15.

7. Data words transferred from 32 word data memory to subsystem at 500 nS per word.

RT TO BC TRANSFER

1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.

2. Status register contents transferred to transmit buffer.

3. NCMDSTRB indicates valid message received, command word available on T0-T15.

4. Data words transferred from subsystem to 32 word data memory at 1 uS per word.

RT TO RT TRANSFER (RECEIVING TERMINAL)